使用 Zelle 图形模块单击鼠标时尝试循环移动红绿灯

Question

from graphics import *

def trafficlight():
  win = GraphWin()
  box = Rectangle(Point(75, 25), Point(125, 175))
  box.draw(win)
  yellow = Circle(Point(100,100), 25)
  yellow.setFill('yellow')
  red = Circle(Point(100,50), 25)
  red.setFill('red')
  green = Circle(Point(100,150), 25)
  green.setFill('green')
  yellow.draw(win)
  red.draw(win)
  green.draw(win)

  win.getMouse()
  red.setFill('grey')
  yellow.setFill('grey')
  green.setFill('green')
  win.getMouse()
  red.setFill('grey')
  yellow.setFill('yellow')
  green.setFill('grey')
  win.getMouse()
  red.setFill('red')
  yellow.setFill('grey')
  green.setFill('grey')
  win.getMouse()

trafficlight()

我的代码可以运行，但唯一的问题是我无法让函数循环，它在跳转到红色后停止，但它需要跳转到绿色，然后是黄色，然后循环跳转到红色。我试过使用函数 win.mianloop() 但这也不起作用。我想使用 while 循环，但我不知道该怎么做，有什么建议吗？

Answer 1

只需在您的函数中加入一个循环即可：

from graphics import *

def trafficlight():
    win = GraphWin()

    box = Rectangle(Point(75, 25), Point(125, 175))
    box.draw(win)

    yellow = Circle(Point(100,100), 25)
    yellow.setFill('yellow')
    red = Circle(Point(100,50), 25)
    red.setFill('red')
    green = Circle(Point(100,150), 25)
    green.setFill('green')

    yellow.draw(win)
    red.draw(win)
    green.draw(win)
    win.getMouse()

    while True:  # Loop forever.
        red.setFill('grey')
        yellow.setFill('grey')
        green.setFill('green')
        win.getMouse()

        red.setFill('grey')
        yellow.setFill('yellow')
        green.setFill('grey')

        win.getMouse()
        red.setFill('red')
        yellow.setFill('grey')
        green.setFill('grey')
        win.getMouse()


trafficlight()

使用 Zelle 图形模块单击鼠标时尝试循环移动红绿灯

Trying to move the traffic light in a loop when clicking the mouse with Zelle graphics module

python

graphics

zelle-graphics